@xxpancake: the rumors are that there is going to be a second one and one of if not the biggest rumor of all as for plot points is Tadashi is not dead and the new badie of the film. A lot of people theorize when Tadashi got into the building something (aka an invention) may have saved him or that the woman was mistaken and more than callahan was in there and the additional mystery person saved hiro's brother. His brother could've been held 'hostage' or even gotten amnesia which is convenient for writers and the "improved baymax scanner" had problems in the abandoned lab so there could've been something like that hindering him from finding Tadashi. So the writers gave themselves a rather large loop hole for further plots those are some of the bigger rumors circulating